If you haven't seen this already, take a look at
FIRECalc. Plug in your net worth, your annual spending, and how long you need that (X years), and it tells you your chances of success based on every possible X-year historical scenario. Note there are tabs at the top of the main page where you can tweak how FIRECalc performs its analysis.
For example, you said your current portfolio generates $43k/year. According to FIRECalc, assuming X=50 years, you need a portfolio of about $1.3mm to have a 100% chance of sustaining that $43k/year (at least based on historical data). But that's just with plugging in the basic three numbers; your portfolio is probably different than what FIRECalc assumes (see the "Your Portfolio" tab).
Now, FIRECalc isn't the last word in retirement calculators, but if you play with it enough, you'll probably get a feel for how portfolio and spending changes can affect your chances of long-term success.
I don't know if this is Mustachian or not, but given that you're willing to move, what about building a new house? I'm sure the up-front costs of building are much higher than buying a "used" house, but: if you plan to live there for a long time,
and you spend the money to make the house super-efficient, it will probably pay off in the long run.
Another benefit of building is that you can have better space utilization. My wife and I like looking at houses for fun. Based on our observations, we came to the conclusion that
layout matters just as much as square footage. We've seen houses that differed by 1000 square feet, but we've often preferred the smaller ones just because the layout better matches our needs. And in the long-run, a smaller house will always be cheaper to heat, cool and maintain. I guess you could call this "living space efficiency", and
efficiency in general is really a fundamental underpinning of Mustachianism.
As you said, your annual spend is $76k, but over half that is on the house ($30k morgage + $10k property tax + $4.8k utilities). If you buy outright, the mortgage goes away, putting you at $46k/year annual spend. That's only $3k away from your current passive income. It should be fairly easy to save another $3k/year by moving (lowering property taxes) and/or other "fat trimming".
Tools like FIRECalc can help you test out different scenarios: e.g. what's the impact of selling off some of your portfolio to buy your house outright?
Is part-time work an option/possibility? You currently work from home, what are the chances you could negotiate (for example) a 50% pay cut for 50% fewer working hours? Or maybe 50% fewer working hours, but a 65% pay cut, and you keep your health insurance (eliminating another variable)?